Listing all results (214)

The Equilibrium Between Nitrogen Dioxide and Dinitrogen Tetroxide

In this classic demonstration, from the Royal Society of Chemistry, an equilibrium mixture of brown nitrogen dioxide and colourless dinitrogen tetroxide is put into a gas syringe, the position of equilibrium can be determined by the colour. The effect of temperature and pressure on an equilibrium is investigated...

Light Scattering by a Colloid (the Tyndall Effect) – ‘the Thiosulphate Sunset’

In this classic demonstration, from the Royal Society of Chemistry, a beam of light is shone through the reaction of sodium thiosulphate and acid, the light is scattered by the colloidal sulphur and is seen as a bluish ‘Tyndall cone’. This can be used to demonstrate why the sky is blue.

The blue of the sky...

The Reaction of Hydrogen Peroxide and Potassium Permanganate – ‘Cannon Fire’

In this classic demonstration, from the Royal Society of Chemistry, potassium permanganate is sprinkled onto a burning solution of hydrogen peroxide and ethanol. Oxygen is evolved in the reaction and it increases the rate of burning, a series of loud bangs is heard.

The resource provides a list of apparatus...

Zinc-plating Copper and the Formation of Brass –'Turning Copper into ‘Silver’ and ‘Gold’'

In this classic demonstration, from the Royal Society of Chemistry, a copper coin is plated with zinc using a solution of sodium zincate in the presence of zinc, the coin will appear silver. When the coin is heated, the zinc and copper form an alloy of brass and so the coin appears gold.

The resource...

The Electrolysis of Molten Lead Bromide

This classic demonstration, from the Royal Society of Chemistry, shows that lead bromide does not conduct when solid but does when molten. The products of bromine and lead can be collected and weighed. A value for the Faraday constant can be estimated.

The resource provides a list of apparatus and chemicals...

The Liquefaction of Chlorine

In this classic demonstration, from the Royal Society of Chemistry, a stream of chlorine is directed at a cold finger condenser containing dry ice and ethanol. The chlorine condenses as yellow droplets.

The resource provides a list of apparatus and chemicals needed for the experiment, together with teaching...

The Equilibrium Between Bismuth Oxide Chloride and Bismuth Trichloride

In this classic demonstration, from the Royal Society of Chemistry, bismuth oxide chloride is dissolved in hydrochloric acid to give a clear solution of bismuth trichloride. Diluting the solution with water re-forms bismuth oxide chloride, a white solid. On adding more acid, the bismuth trichloride re-forms.

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Catalysts for the Thermal Decomposition of Potassium Chlorate

In this classic demonstration, from the Royal Society of Chemistry, the time taken for enough oxygen to be evolved from the decomposition of potassium chlorate to re-light a glowing splint is observed. This is then repeated with the addition of various oxide catalysts, the catalysts can be separated and weighed to...

The Electrical Conduction of Silicon – a Semiconductor

In this classic demonstration, from the Royal Society of Chemistry, silicon is connected in series with a power pack and ammeter. At room temperature, a very small current flows. This can be increased by heating the silicon with a hairdryer and this can be compared with a coil of copper when the current will...

Turning ‘Red Wine’ into ‘Water’

In this classic demonstration, from the Royal Society of Chemistry, a solution of acidified potassium dichromate, which looks like red wine, is poured into beakers with small amounts of colourless solutions in. The colour changes to water, milk, raspberry milkshake and lemonade. The solutions used are barium...

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